<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>过滤器</title>
  </head>
  <body>
    <div id="app">
      <div>{{ num }}</div>
      <div>美元：{{ transition("$") }}</div>
      <div>人民币：{{ transition("￥") }}</div>
    </div>
    <script src="./vue.js"></script>
    <script>
      let app = new Vue({
        el: "#app",
        data: {
          num: 1234,
        },
        methods: {
          transition(flag) {
            return flag + this.num;
          },
        },
      });
    </script>
  </body>
</html>
